Rabbitmq server: RabbitMQ is a messaging and streaming broker. (CVE-2026-67220)
Description
CVE-2026-67220 is a vulnerability in RabbitMQ server affecting versions prior to 3.13.15, 4.0.20, 4.1.11, 4.2.6, and 4.3.0. It involves the handling of bindings on x-jms-topic exchanges where the server processes selector strings without length limits or proper validation, leading to atom table exhaustion. An authenticated low-privilege AMQP user confined to one virtual host can cause a denial of service by crashing the broker node with fewer than 100 bind calls. The issue requires the rabbitmq_jms_topic_exchange plugin to be enabled and specific permissions on exchanges and queues. Fixed versions have been released to address this issue.
CVSS v4.0
Affected software
pkg:deb/ubuntu/rabbitmq-server?arch=source&distro=esm-infra-legacy/xenialpkg:deb/ubuntu/rabbitmq-server?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/rabbitmq-server?arch=source&distro=esm-infra/focalpkg:deb/ubuntu/rabbitmq-server?arch=source&distro=jammypkg:deb/ubuntu/rabbitmq-server?arch=source&distro=noblepkg:deb/ubuntu/rabbitmq-server?arch=source&distro=resoluteRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
RabbitMQ server versions prior to 3.13.15, 4.0.20, 4.1.11, 4.2.6, and 4.3.0 contain a vulnerability in the handling of bindings on x-jms-topic exchanges. When a binding is created, the server reads the rjms_erlang_selector argument and passes it through erl_scan:string/1 and erl_parse:parse_term/1. The erl_scan:string/1 function interns every atom literal it tokenizes without a length cap, and validate_binding/2 does not limit or reclaim atoms. This allows an authenticated low-privilege AMQP user with read access on an x-jms-topic exchange and write access on a queue to crash the entire broker node by exhausting the Erlang atom table with fewer than 100 bind calls. The vulnerability requires the rabbitmq_jms_topic_exchange plugin to be enabled. The issue is fixed in versions 3.13.15, 4.0.20, 4.1.11, 4.2.6, and 4.3.0.
Potential Impact
An authenticated low-privilege AMQP user confined to a single virtual host can cause a denial of service by crashing the entire RabbitMQ broker node. This cross-tenant DoS can be triggered with fewer than 100 binding calls on an x-jms-topic exchange when the vulnerable plugin is enabled. This impacts availability of the messaging service.
Mitigation Recommendations
A fix is available in RabbitMQ versions 3.13.15, 4.0.20, 4.1.11, 4.2.6, and 4.3.0. Users should upgrade to one of these versions or later to remediate this vulnerability. No other mitigations are indicated in the advisory.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-67220
- Osv Schema Version
- 1.7.0
- Ecosystems
- ["Ubuntu:Pro:16.04:LTS","Ubuntu:Pro:18.04:LTS","Ubuntu:Pro:20.04:LTS","Ubuntu:22.04:LTS","Ubuntu:24.04:LTS","Ubuntu:26.04:LTS"]
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6ad3f5ac2cdf04f656662801
Added to database: 10/17/2026, 22:24:44 UTC
Last enriched: 10/18/2026, 00:05:03 UTC
Last updated: 10/18/2026, 00:05:03 UTC
Views: 2
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